Sawing apparatus



May 11, 1937 R. TRAUT 2,079,974

SAWING' APPARATUS Filed Nov. 22, 193s Patented May `11, 1937 2,079,974

UNITED STATES EXTENT GFFICE SAWING APPARATUS Rudolf Traut, Mulhem-Ruhr, Germany Application November 22, 1933, Serial No. 699,146 In Germany December 24, 1932 5 Claims. (Cl. .Z9-69) It is known to cut into equal lengths welded vertically disposed rolls 3 and 4 respectively of tubes which have been produced from long the rolling mill. The driving motor I is also welded strips and which leave the welding macoupled to the driving gear 5 whose transmission chine or welding rolling mill in an endless strip ratio can be changed. This driving gear 5 drives 5 by a reciprocating cutting apparatus disposed through worm wheel 6 a pinion drive which con- 5 to the rear of the rolling mill. For securing unisists essentially of the wheel 1 and the pinion 8. formity in the length of the sections of tube cut The wheel I is toothed over a small part of its oir, the tube as it comes from the rolling mill periphery, and similarly the pinion 8 is toothed strikes against a stop disposed a predetermined only on `a certain part of its periphery. The

l distance from the rolling mill, this stop being toothed peripheries of the two wheels are the l0 employed for actuating the mechanism producsame in length. Directly adjacent to the pinion ing the reciprocation of the cutting apparatus. 8 there is firmly keyed on to the spindle l0 a It has been found that this apparatus works conveyor disc 8a. This conveyor disc is provided perfectly in cutting tubes of the same length with a shoe 8b, which disposes itself against the l if the tube leaves the rolling mill at a relatively untoothed smooth crown of the wheel 1. So long 15 SIOW speed, Such for example as three to ve as this disposition holds the conveyor disc and metres per minute. In rolling mills, which opertherefore also the pinion 8 and the Spindle I0 ate at higher speeds, however, for example, at cannot rotate, while the wheel 'l remains in conrom sixty to eighty metres per minute, it has tinuous rotation, driven by the continuously robeen found that the stop-operated cutting matating spindle 9. The wheel l is also provided 20 chine produces tubes of varying lengths. The with arms 'la and lb, which have at their ends causes of this are that with the stop-switches rollers which can engage in the CIlGaWaY Darts and the electrical and mechanical devices conof the conveyor disc 8- If the Wheel 'I iS, When nected thereto the switching operations are not the gearing is in the position indicated in the :i5 effected in the same time, and that even small drawing, rotated in the direction indicated by 25 differences such as may produce an undesirable the arrow, the conveyor roller on the arm 'Ia difference in lengths of tubes cut off may occur first enters the lower recessed part of the consuch, for example, as are caused by fluctuations veyor disc 8a, and causes the conveyor disc to in the voltage of the electric current or change in rotate, rotation continuing until the two toothed 3g the' co-eiiicients of friction of the brakes emcrowns of the wheel 'I and the pinion 8 come into 30 ployed, in the oase of the relatively high speed of engagement- Thereupon the Spindle I5 S 10- delivery. Furthermore, with the apparatus tated further by the inter-engagement of the hitherto employed, in which the moving mechatoothed wheels 'I and 8, until the spindle I0 has nism of the cutting machine is actuated by a made approximately three-quarters of a rotag5 special driving gear it is difcult to ensure that tion. The conveyor roller of the arm 'ib then 35 the speed of the cutting machine shall correenters the other recess in the conveyor disc 8a, spond to the speed at which the tube leaves the and returns the latter into the position indicated, rolling mill which again is absolutely essential in whereupon the spindle Illwhich by that time rolling mills which eject the tube at high speed. has made a complete rotation of 360-comes to 4 0 To avoid these disadvantages it is proposed rest, while the spindle 9 with the wheel 'I con- 40 according to the invention to drive the movement tinues to rotate, that is to say, until the lever arm producing mechanism of the cutting machine la, again reaches the position now shown in the from the driving motor of the rolling mill and so drawing, and repeats the sequence of movements to construct this mechanism that the cutting hereinbefore described as it is further rotated.

operation always takes place according to a de- 'Ihe spindle 9 thus rotates continuously with the 45 nite speed of the rolling mill. spindle 1, while the spindle I9 is rotated after a The apparatus according to the invention is certain period through 360 degs. by the conveyor illustrated, by way of example, in the accomdisc 8a, after which it remains stationary for a panying drawing. certain length of time. The spindle 9 of the 5o' Figure 1 is an elevation o the apparatus. wheel 'I is coupled to the worm wheel spindle of 50 Figure 2 is a corresponding plan. the worm wheel 6, while the spindle Il) of the Figure 3 is a section through the cutting pinion 8 has secured to it the crank II which mechanism, which may be, for example, a saw. rocks the spindle I4 by meansof the connecting Referring to the drawing, the motor I drives rod I2 and the lever I3. The lever I6 is secured through toothed gearing. 2, the horizontally and to the end of the spindle I4 opposite to the end 55 at which the lever I3 is secured; the spindle I4 is mounted in bearings I5. The upper part of the lever I6 is formed with a longitudinal slot in which moves the slide block 'Ihe slide block I'I may be moved by the screw-threaded spindle I8, carrying at its lower end the bevelled wheel I3, which engages with the bevel wheel 20 loosely mounted on the rocking spindle I4. The bevel wheel 28 is connected toA a worm wheel 2|, which is loosely mounted on the rocking spindle I4 and which is rotated by means of the worm 22 and the reversing motor 23. By this means it is possible for the slide block I1 to be moved by the motor 23 into any position of the connecting link of the lever I 6. The connecting rod 24 is linked to the slide block I'I by means of a forked bracket and at the other end is connected to the sawing apparatus. The latter consists of the carriage 26, which runs on the four wheels-25 and carries the table 28 which is adapted to rock about the spindle 2l and on which is secured the saw-driving motor 29, the saw 30 being mounted on the extension of the motor shaft. The table 28 is held in the horizontal position by the spring 3| and can be tipped to one side by means of the lever 32, which is loosely mounted to rotate on the spindle 2, and contacts at one side with a projection on the table 28. The lever 32 is actuated during the forward movement of the saw carriage by the lower end of the lever 32 striking against the plate or cam 33 having the contacting surface inclined to the direction of travel of the saw carriage, which is secured to the frame 34- below the saw carriage; the rails 35 for the saw carriage wheelsare provided on the upper part of the frame 34. On the saw carriage 26 is mounted the slide channel 36 through which the tube passes, the channels 31 and 38 being disposed in fixed position in the path of the tube. Closely adjacent the slide channels 38 is a roller train (not shown in the drawing) for carrying away the cut-off tubes. The worm wheel 2| has also connected to it the toothed wheel 39, which on the rotation of the worm wheel rotates the spindle 45 by means of the toothed wheel 48 through the spindle 4I, the bevelled wheels 42, the spindle 43 and the chain gear 44, which causes the necessary change speed in the gearing.

The apparatus operates as follows:-

The tube leaving the last pair of rolls 4 of the rolling mill slides through the Channels 37, 36 and 38 at a speed which, when the .rolls are rotating at a particular speed, is determined by the working diameter of the rolls when the latter are rotating. The speed at which the tube is ejected is constant when the speed of rotation of the rolls or of the driving motor is constant. Similarly when the speed of rotation of the driving motor is constant, the speed of rotation of the pinion spindle 3 is also constant; while also the periodic repetition of the movement of rotation of the pinion spindle I 8 and therefore also the periodic repetition of the sawing operation is similarly constant. Uniformity of length of the tubes to be Cut off thus necessarily follows by reason of the cutting operation occurring at regular intervals where the speed of movement of the tube leaving the rolls is constant.

The saw carriage is caused to reciprocate from time to time by the levers secured to the rocking spindle I4 and the rods I2 and 24 linked thereto, by means of the pinion drive. When the saw carriage advances in the direction taken by the ejected tube, the lever 32 hits against the inclined plate or cam 33; this causes the saw table to tilt around the rocking spindle 2T towards the tube, and the blade of the saw cuts 01T the section of tube. As the saw carriage moves on in the direction taken by the tube the rocking lever 32 ceases to press against the inclined plate or cam 33, whereby the saw table is returned by the spring 3| to its original position. When the saw carriage has reached the eXtreme righthand position, it immediately returns to its lefthand extreme position, the lever 32 striking against the plate or cam 33 but moving in the opposite direction to that previously taken, when it can swing freely without moving the sawtable 28.

The saw makes its cut at about the middle of the travel of the saw carriage, that is to say, at about the middle position of the lever I6.

The effective length of the operative arm of the lever I6 can be varied by shifting the slide block I 1. The speed of rotation of the pinion drive 'I and 8 and the ratio between the arms. I3 and I3 are so determined that at the middle position of the saw-that is to say, at the moment of cutting-the speed of the saw is at least equal to the speed at which the tube is ejected. This condition rnust always be fulfilled in order to ensure that the cutting of the tube is effectively carried out. If the length of the tube that is to be cut oif is to be changed and, for example, a greater length of tube is to be cut off, the conversion ratio of the gearing 5 is changed by rotating the spindle 45 in such manner that the spindle 8 of the pinion gearing rotates more slowly. This increases the time taken by each set of movements of the saw, and as the conversion of the rolling mill drive and therefore also the ejecting speed of the section of tube remains unaltered, the sections of tube cut of are lengthened as the time taken by one round of operations of the saw increases. If on the other hand shorter tubes are to be cut the time taken by one round of operations of the saw is reduced by correspondingly increasing the speed of rotation of the spindle 9.

If when cutting one particular length of tube the speed of the pinion drive and the relative positions of the levers I3 and i6 are so arranged that at the moment of the cutting operation the speed of travel of the saw carriage is the same as the speed of movement of the tube, this uniformity of condition will no longer exist if when cutting a different length of tube only the speed of rotation of the pinion spindle 9 is altered. In order that when there is a change in the speed of rotation of the spindle 9 there should be no change in the speed of cutting in the middle position, a change is made in the operative length of the lever I 6 simultaneously with the change in the speed of rotation of the spindle 9. Thus for example, if in order to cut a longer tube the speed of rotation of the spindle 9 is reduced, the speed of the saw carriage would be less at the moment of cutting than the speed of the tube.

In order to compensate for this reduction in speed the operative arm of the lever I6 is lengthened to correspond by moving the slide block I1 upwardly. In this way the complete movement of the saw carriage in one direction is at the same time increased and therefore the speed of movement of the carriage at the middle position is also correspondingly increased. The change of conversion ratio of the gearing 5 and the movement of the slide block Il in the connecting link of the lever I6 are effected simultaneously from the motor 23 which causes the rotation of the spindle |8 through the worm gear 2|, 22 and the pair of bevelled wheels I9, 20 and at the same time rotates the adjusting spindle 45 of the gearing 5 through the toothed Wheels 39, 40 and the spindles 4| and 43. It is thus possible without interrupting the cutting operation to alter the length of the tube cut within predetermined limits.

I claim:

1. Apparatus for cutting into sections of equal length tubes produced by apparatus such as a rolling mill, comprising a bed extending parallel to the direction of travel of the tube, a carriage adapted for reciprocation upon the said bed, a saw, and means for operating the said saw mounted for movement upon the said carriage in a direction transverse to the direction of trave1 of the tube, means positioned in the length of the bed for effecting an oscillatory movement of the saw, means for reciprocating the carriage upon the bed, a change speed gear operatively coupled to the drive of the rolling mill, and variable transmission gear between the said change gear and the means for reciprocating the carriage, said transmission gear including an element that is operated intermittently to transmit an intermittent movement to the means for reciprocating the carriage, the change gear effecting a change in the speed imparted to the transmission gear and the transmission gear varying the travel of the carriage in accordance with the change in length of the sections of tube to be severed and in dependence one on the other.

2. Apparatus for cutting into ysections of equal length tubes produced by apparatus such as a rolling mill, comprising a bed extending parallel to the direction of travel of the tube, a carriage adapted for reciprocation upon the said bed, a saw, and means for operating the said saw mounted for movement upon the said carriage in a direction transverse to the direction of travel of the tube, means positioned in the length of the bed for effecting an oscillatory movement of the saw, a change speed gear operatively coupled to the driving gear of the rolling mill, a pinion gearing receiving movement from the change speed gear, said pinion gearing having elements formed so that the driving pinion is continuously rotated and the driven pinion intermittently rotated, a crank shaft mechanism operated by said pinion gear, and a rocking element coupled to said crank mechanism, said rocking element being linked to the said carriage and imparting a variable travel to the said carriage, the change gear effecting a change in the speed of oscillation imparted to the rocking element and the latter being adjusted to vary the travel of the carriage in accordance with the length of the sections of the tube to be severed and in dependence one on the other.

3. Apparatus for cutting into sections of equal length tubes produced by apparatus such as a rolling mill, comprising a bed extending parallel to the direction of travel of the tube, a carriage adapted for reciprocation upon the said bed, a saw, and means for operating the said saw mounted for movement upon the said carriage in a direction transverse to the direction of travel of the tube, means positioned in the length of the bed for effecting an oscillatory movement of the saw, a change speed gear operatively coupled to the driving gear of the rolling mill, a pinion gearing receiving movement from the change speed gear, said pinion gearing having elements formed so that the driving pinion is continuously rotated and the driven pinion intermittently rotated, a crank shaft mechanism operated by said pinion gearing, and a rocking element coupled to said crank mechanism, said rocking element being linked to the said carriage, the change gear eifecting a change in the speed of oscillation imparted to the rocking element in accordance with the length of the sections of the tube to be severed, and the connection between the rocking element and the carriage being adjustable in the radial direction of the rocking element for variation of the travel of the carriage and of its speed of movement.

4. Apparatus according to claim 3, comprising a motor, gearing driven by said motor, adjusting means connecting said gearing with said change gear for variation of the gear ratio, and adjusting means connecting with said gear and effecting the adjustment of the connection between the rocking element and the carriage in a direction to or from the pivotal axis of the said element.

5. Apparatus according to claim 3, comprising a motor, adjusting means for adjusting the change gear for variation of the gear ratio, a rotatable screwed spindle mounted on said rocking element and extending in a direction radially with reference to the axis of the said element, a slide block slidably carried by said rocking element and screw-threaded to engage the said screw-threaded spindle, said slide block being linked to the carriage and gearing connecting the said motor with the said adjusting means and with the said spindle for effecting the required adjustments.

RUDOLF TRAUT. 

